As soon as I sent that it occurred to me that they may only need the
rods. They have to have recorded what the weights for each rod were
supposed to be and they only have to fix the 2. Not exactly sure how
one would go about adding weight already removed with out welding and
wrecking the casting, But I would guess it is possible. Not being a
welder, I am not sure. I might be a bit suspicious, but I think it is
possible to fix that problem with out all the bits and pieces.
BTW, as I recall, they also needed the bearings.
Larry
On Jun 10, 2005, at 8:01 PM, Larry Macy wrote:
> Glen,
>
> I am no expert on this stuff, but I have to say YES, you are getting
> hosed. Seems to me you need the rods and the pistons, rings etc to
> balance the engine. I think you also need the crank. And perhaps the
> flywheel. I know when I had this done on a now broke motor, they
> wanted everything. Broke for an entirely different reason.
>
> I can see why the rods would be different. The object, as I
> understand it, is to get all the throw weights the same. And I do
> believe that includes the counter-balances formed into the crank.
>
> I could be a crank on this, but I don't think so.
>
> Larry
>
> On Jun 10, 2005, at 7:12 PM, Glen Byrns wrote:
>
>
>> Is there anyone on the list with knowledge of correct technique for
>> dynamic
>> balancing of internal engine parts?
>>
>> I got back the crank, rods, pistons, flywheel, pressure plate, and
>> harmonic
>> balancer for the 948 I'm building for the Austin A35. They had
>> mixed up the
>> #2 and #3 rod before balancing. Since the #2 rod cannot be used in
>> the #3
>> position, I called and asked what they needed to redo the balancing
>> with the
>> rods in the correct positions and they replied that they only
>> needed the rods
>> back. This made me damn suspicious that they are full of crap. I
>> took the
>> rods to work and weighed them on an accurate balance with the
>> following
>> results:
>> #1-----644.0g
>> #2-----647.5g
>> #3-----657.5g
>> #4-----661.0g
>>
>> There may be some reason that the rods can be of such different
>> weights and
>> still have a dynamically balanced engine I guess, but I thought
>> step #1 was to
>> match the weights of all the rods and pistons BEFORE the dynamic
>> balancing is
>> begun.
>>
>> Am I getting hosed?
>>
>> Glen Byrns
>>
>
--
Larry Macy
78 Midget
Keep your top down and your chin up.
Larry B. Macy, Ph.D.
macy@bbl.med.upenn.edu
System Manager/Administrator
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 10 Gates
Philadelphia, PA 19104
Ask a question and you're a fool for three minutes; do not ask a
question
and you're a fool for the rest of your life.
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